Three-point door-bolt.



J. H. STEWART.

THREE POINT DOOR BOLT,

APPLICATION FILED APR. 6. l9I5 JOHN H. STEWART, or JAMAicA, NEW YORK.

THREE-POINT noon-BOLT.

Specification of Letters Patent.

- Application filed April 6, 1915. Serial No. 19,509.

T0 aZZ whom it may concern Be it, known that 1, JOHN H. STEWART, a subject of the King of Great Britain, residing at Jamaica, in the county of Queens and State of New York, have invented certain new and useful Improvements in Three- Point Door-Bolts, of which the following is a full, clear, and eXact specification.

This invention relates to three point bolts especially designed for exit doors and accordingly provided with emergency actuating means. I

One object of the invention is to simplify the construction and mode of operating the horizontally sliding-bolt from the vertically movable bolt, and another objectris to adapt both bolts to be controlled by emergency operating means.

Other objects will appear as the description proceeds.

The invention will be first hereinafter described in connection with the accompanying drawings which constitute part of this specification, and then more specifically defined in the claims at the end of the description.

In the accompanying drawings, wherein similar reference characters are used to designate corresponding parts throughout the several views :-Figure 1 is an elevation of a door equipped with my invention. Fig. 2 is an enlarged elevation of the free edge portion of the door, parts of the-floor or sill and top and side of the frame being shown in section, and the emergency operating means and front plate of the casing for the horizontally sliding bolt being removed for the sake of clearness. Fig. 3 is a vertical transverse section through the door, sill, top of the door frame andcasin g for the horizontally sliding bolt, the vertically movable bolt being shown in elevation and the emergency operating device in end view, and Fig. 4 is an enlarged front elevation of the casing for the horizontally sliding bolt and one end of the emergency operating dev1ce.

The vertically movable bolt 1 is guided in suitable brackets 2 and 3 secured to the inner face of the door 4:, and extends through the casing 5 for the horizontally sliding bolt 6. The lower end ofthe bolt 1 is adapted to engage a perforation or socket 7 in the sill plate 8, while the upper end of said bolt is bent inwardly at right angles to form a hook 9 adapted to interlock with a loop or strap 10 secured to and depending from the top of the door frame. The end of the hook 9 is beveled, as at 11, Fig. 3, to insure its.

riding up over the strap or. loop when the door is closed. The sill plate 8 is inclined on the outside, as at 12, for raising the bolt 1 automatically as the door is closed. This Patented uly 13, 1915.;

inclined portion 12 of the sill plate is arranged in advance of the loop 10, so that the hook 9 may be raised above the engaging portion of said loop before reaching the same and retained in such supported posi tion while the lower end of the bolt 1 rides along the top of the sill plate, until the opening or socket 7 is reached, at which time the hook, or rather the tooth of the hook, will have reached a point beyond the engaging portion of the loop 10. In this way, both of the locking points of the bolt 1, namely, the lower end of said bolt and the hook on the upper end'thereof, may be an tomatically brought to locked positions by the sill plate as the door is closed, without depending upon the inclined end 11 of the hook 9 to effect the locking thereof.

The portion of the bolt 1 whichextends through the'casing 5 is preferably angular in cross section, as shown at 13 in Figs. 2 and 3, and on the side of said angular portion facing the free edge of the door there is formed a' rounded knob or protuberance 14: which is housed in the casing 5. The horizontally sliding bolt 6 is pivoted, as at 15, to the lower end of acam member 16 which is itself pivoted at 17 near its upper end to the casing 5. This member 16 is provided with a cam surface 18 extending above and below the-pivot 17 and terminating in upper and lower protruding portions 19 20- arrangedrespectivelyat the top and bottom of said cam surface. The knob or protuberance 1 1 on the bolt 1 extends into the concavity of this cam surface and is adapted to engage the upper protruding portion 19 thereof, when the bolt 1 is raised, for simultaneously withdrawing the horizontally sliding bolt 6. Said knob 1a is also adapted to engage the protruding portion 20 at the lower end of the cam surface 18 when the bolt 1 is lowered into locking position for advancing or shooting the horizontally sliding bolt 6. It will be observed that the automatic raising of the bolt 1 on the sill plate as the door is closed, will cause the knob 14 to engage the upper protruding portion 19 of the cam member and operate to withdraw the bolt 6, and that when the bottom of the bolt 1 reaches the opening or socket 7, said bolt in falling will bring the knob 1% into engagement with the lower protruding portion 20 of the cam member, thereby shooting the bolt 6 and efiecting a simultaneous looking at all three points.

The portion of the bolt 1 which is arranged within the casing 5, is provided. with a vertical slot 21 in which the rounded inner end 522 of a bell crank lever 23 extends for actuating said bolt, said lever being pivoted at 24: between lugs 25 on the front of the casing 5, see Figs. 3 and l. The outer end of the lever 23 is inclined downwardly and inwardly and preferably extends below its inner end 22 which engages the slot 21 in the bolt 1. This depending outer end of the bell crank lever 23 is connected to one end of a horizontal bar 25 which extends across the door and has its other end supported by a pivoted hanger 26 depending from a plate or bracket 27 on the door, as illustrated in Fig. 1, said bar and its connections constitilting the emergency operating device for the bolts. It will be readily understood that when pressure is eXerted against the bar 25, it will be moved to the position illustrated in dotted lines in Fig. 3, thereby shifting the inner end 22 of the lever 23 so as to raise the bolt 1, simultaneously releasing both the upper and lower locking points of said bolt and the horizontally sliding bolt 6.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent of the United States is 1. The combination with a longitudinally movable bolt having a laterally projecting knob, of another bolt movable at right angles to the first bolt, and a cam member pivoted to the second bolt and arranged in the plane of the first bolt, said cam member extending into the path of the knob on the first bolt for operating the second bolt simultaneously with the operation of the first bolt.

2. The combination with a vertical bolt having a knob projecting therefrom, of a horizontal bolt, and a cam member connected to the horizontal bolt and having protruding portions extending into the path of the knob on the vertical bolt above and below said knob, whereby the horizontal bolt will be actuated to correspond with a movement of the vertical bolt in either direction.

8. The combination with a vertical bolt having a knob projecting therefrom, of a horizontal bolt, a cam member connected to the horizontal bolt and projecting into the path of the knob on the vertical bolt, whereby said horizontal bolt is actuated by the movement of the vertical bolt, and an emergency actuating device having a bell crank lever engaging the vertical bolt for operating the same.

4. The combination with a vertical bolt having a slot therein and a knob projecting therefrom, of a horizontal bolt, a cam member connected to the horizontal bolt and projecting into the path of said knob, whereby the horizontal bolt is actuated by the movement of the vertical bolt, and an emergency operating device having a bell crank lever engaging the slot in the vertical bolt for actuating the same.

5. A single vertical bolt for exit doors adapted for lock engagement at its upper and lower ends, means to raise said bolt for release at both ends, a horizontal bolt, a pivotally mounted cam device, a pivotal connection between said horizontal bolt and cam device, and a protuberance on said vertical bolt in the path of said cam device whereby the horizontal bolt is actuated by the movement of the vertical bolt.

In testimony whereof I have signed my name to this specification in the presence of two attesting witnesses.

A. HAEGEN, WM. M. CHRISTIE.

fiopies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

